如何使用 Python 在 mongodb 的分片集合中启用分片？

Question

Currently, I am using a bash-script in order to enable sharding for DB and then shard collection. I am using eval:

mongo <ip_host> --eval "sh.enableSharding(<name_db>)

and then, surprise, shard collection:

mongo <ip_host> --eval "sh.shardCollection("<db_name>.<collection>", {shardKey : 1})"

I am trying to do the same, but from Python using pymongo lib. I have some ideas:

client = pymongo.MongoClient()
client.admin.command('enableSharding', db_name)    
client.admin.command('shardCollection', f'{db_name}.{collection}), key=shard_key)

or using eval:

db_name.eval("sh.enableSharding", collection)
db_name.eval("sh.shardCollection", collection)

But neither of these methods work. Is there anything you could suggest or should I use os.system() to call bash-scripting from Python?

Answer 1

Your command client.admin.command('enableSharding', db_name) is correct; however it can only be run against a mongos instance ; I suspect you are trying to run it against a mongod instance.